TOEFL: New research is looking into how plants can be used to generate electricity and produce artificial light.
TOEFL: Why did the most abundant bird in the world go extinct in just 50 years?
TOEFL: Scientist have discovered a supernova that is behaving in an unusual way.
TOEFL: A clip about how English became the dominant world language and the (unfair) advantages
it gives its speakers.
TOEFL: A clip about how effective brain training apps are at making you smarter.
TOEFL: Two professors offer contrasting opinions on recent research concerning how genetics affects a person's intelligence.
TOEFL: A professor talks about the science of pain.
TOEFL: A professor talks about the evolution of three different types of dog intelligence.
TOEFL: Professor Roll Vertigal answer whether a phone get heavier when you load music on to it.
TOEFL: Author Douglas Preston describes the discovery of an ancient lost city in Honduras - the Lost City of the Monkey God.
TOEFL: New Zealand starts a gene drive to remove all of the predators from the country.
TOEFL: A lecture on a condition called misophonia which makes people sensitive to annoying sounds.
IELTS: A short lecture on the history of the Mongol Empire.